C02F 9/20
Portable or detachable small-scale multistage treatment devices
Official title: Portable or detachable small-scale multistage treatment devices, e.g. point of use or laboratory water purification systems
C02F9/20 (Portable or detachable small-scale multistage treatment devices) appears on 998 US grants and 1,005 published applications in this corpus.
Search patents in C02F- Granted patents
- 998
- Published applications
- 1,005
- Assignees
- 573
- Inventors
- 2,047
- Latest grant
- 23 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 5 | 0 |
| 1978 | 8 | 0 |
| 1979 | 4 | 0 |
| 1980 | 3 | 0 |
| 1981 | 4 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 4 | 0 |
| 1986 | 7 | 0 |
| 1987 | 4 | 0 |
| 1988 | 9 | 0 |
| 1989 | 22 | 0 |
| 1990 | 16 | 0 |
| 1991 | 23 | 0 |
| 1992 | 18 | 0 |
| 1993 | 15 | 0 |
| 1994 | 12 | 0 |
| 1995 | 19 | 0 |
| 1996 | 16 | 0 |
| 1997 | 20 | 0 |
| 1998 | 16 | 0 |
| 1999 | 26 | 0 |
| 2000 | 27 | 0 |
| 2001 | 31 | 5 |
| 2002 | 28 | 32 |
| 2003 | 29 | 53 |
| 2004 | 34 | 35 |
| 2005 | 29 | 63 |
| 2006 | 23 | 43 |
| 2007 | 28 | 45 |
| 2008 | 27 | 33 |
| 2009 | 20 | 47 |
| 2010 | 37 | 41 |
| 2011 | 21 | 33 |
| 2012 | 24 | 35 |
| 2013 | 25 | 32 |
| 2014 | 16 | 31 |
| 2015 | 23 | 29 |
| 2016 | 20 | 29 |
| 2017 | 23 | 28 |
| 2018 | 22 | 51 |
| 2019 | 39 | 53 |
| 2020 | 41 | 51 |
| 2021 | 43 | 53 |
| 2022 | 32 | 45 |
| 2023 | 31 | 33 |
| 2024 | 22 | 44 |
| 2025 | 29 | 26 |
| 2026 | 17 | 35 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Online biological monitoring in decentralized non-potable water system23 Jun 2026US 12,662,406 B2Natural Systems Utilities, LLC
- Water purifier9 Jun 2026US 12,649,670 B1
- Water purifier having composite filter26 May 2026US 12,637,377 B2Coway Co., Ltd.
- Sewage filtering and purifying device19 May 2026US 12,630,448 B2
- Cartridge extraction unit for water purifier5 May 2026US 12,616,333 B2Strauss Water Ltd
- A water treatment cartridge1 Oct 2026US 2026/0296943 A1HCL Technologies Limited
- Fluid purification device using nano filtration1 Oct 2026US 2026/0296944 A1Unger Marketing International, LLC
- Modular Water Disinfection System with Integrated UV-C, Ozone, and IoT Monitoring.24 Sep 2026US 2026/0285730 A1
- Water filtration system and method of use24 Sep 2026US 2026/0285731 A1Outreach Corporation
- Onsite thermal evaporation and treatment system for produced wastewater in oil and gas operations10 Sep 2026US 2026/0265084 A1
Most cited
By later US patents
- Inductively coupled ballast circuit436US 6,825,620 B2Access Business Group International LLC · 2004
- Water treatment system with an inductively coupled ballast432US 6,436,299 B1Amway Corporation · 2002
- Inductively powered lamp assembly370US 6,731,071 B2Access Business Group International LLC · 2004
- Radio frequency identification system for a fluid treatment system361US 6,673,250 B2Access Business Group International LLC · 2004
- Inductively coupled ballast circuit355US 7,385,357 B2Access Business Group International LLC · 2008